A method, device, electronic device and medium for determining short-circuit position of battery cell

Abstract

The present application discloses a method, device, electronic device and medium for determining the short-circuit position of a battery cell, the method comprising: obtaining at least one resistor of a battery cell not injected with electrolyte, the at least one resistor comprising at least one of a first resistor between an anode tab and a cathode tab, a second resistor between an anode tab and a packaging bag, and a third resistor between a cathode tab and a packaging bag; based on the at least one resistor, determining the battery cell state of the battery cell, the battery cell state comprising at least one of no short circuit, cathode short circuit, anode and packaging bag short circuit, and cathode and packaging bag short circuit, the first resistor is used to determine whether it is in the cathode and packaging bag short circuit state; the second resistor or the third resistor is used to determine whether it is in the no short circuit or cathode short circuit state, or the anode or cathode and packaging bag short circuit state; the magnitude relationship between the second resistor and the third resistor is used to determine whether it is in the anode and packaging bag short circuit state or the cathode and packaging bag short circuit state. The above scheme can realize the determination of the short-circuit position of the battery cell.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a method, device, electronic device and medium for determining a short-circuit position of a battery cell. Background Art

[0002] The internal short circuit of the battery cell will affect the storage and use of the battery cell. For example, the self-discharge caused by the internal short circuit will cause the battery cell to fail during storage due to low voltage, zero voltage, etc. The internal short circuit may cause poor self-discharge consistency among a batch of battery cells in the battery pack, leading to safety problems such as overcharging and over-discharging, ultimately reducing the life of the battery module or causing safety problems.

[0003] Short circuits may occur at multiple locations inside the battery cell, and how to determine the short circuit location of the battery cell has become an urgent problem to be solved. Summary of the invention

[0004] The present application at least provides a method, device, electronic device and medium for determining the short-circuit position of a battery cell.

[0005] The present application provides a method for determining a short-circuit position of a battery cell, comprising: obtaining at least one measured resistance of a battery cell to be tested, wherein the battery cell to be tested is not filled with electrolyte, and the at least one measured resistance includes at least one of a first measured resistance between an anode electrode tab and a cathode electrode tab of the battery cell to be tested, a second measured resistance between an anode electrode tab and a packaging bag, and a third measured resistance between a cathode electrode tab and a packaging bag; based on the at least one measured resistance, determining a battery cell state of the battery cell to be tested, wherein the battery cell state includes at least one of a non-short-circuit state, a cathode-cathode short-circuit state, an anode-cathode short-circuit state, and a cathode-cathode short-circuit state, wherein the first measured resistance is used to determine whether the battery cell to be tested is in a cathode-cathode short-circuit state; the second measured resistance or the third measured resistance is used to determine whether the battery cell to be tested is in a first short-circuit state or a second short-circuit state, wherein the first short-circuit state is a non-short-circuit state or a cathode-cathode short-circuit state, and the second short-circuit state is a cathode-cathode short-circuit state or a cathode-cathode short-circuit state; and the magnitude relationship between the second measured resistance and the third measured resistance is used to determine whether the battery cell to be tested is in a cathode-cathode short-circuit state or a cathode-cathode short-circuit state.

[0006] In the above scheme, the measured resistance of the battery cell can reflect the resistance value inside the battery cell. The battery cell state can be determined based on at least one measured resistance of the battery cell to indicate the short-circuit position of the battery cell. The resistance between the anode tab and the cathode tab can reflect whether there is a short circuit between the cathode and cathode of the battery cell. The resistance between the anode tab and the packaging bag or the resistance between the cathode tab and the packaging bag can reflect whether the battery cell is in the first short-circuit state or the second short-circuit state. The relationship between the second measured resistance and the third measured resistance can reflect whether there is a short circuit between the anode and the packaging bag or between the cathode and the packaging bag.

[0007] In some embodiments, determining the cell state of the cell to be tested based on at least one measuring resistor includes at least one of the following steps: when the number of at least one measuring resistor is two, and the two measuring resistors are a first measuring resistor and a fourth measuring resistor, determining whether the cell to be tested is in a non-short-circuit state, a cathode-cathode short-circuit state, or a second short-circuit state based on the first measuring resistor and the fourth measuring resistor, and the fourth measuring resistor is the second measuring resistor or the third measuring resistor; when the number of at least one measuring resistor is two, and the two measuring resistors are a second measuring resistor and a third measuring resistor, determining whether the cell to be tested is in a first short-circuit state, anode-to-packaging bag short-circuit state, or cathode-to-packaging bag short-circuit state based on the second measuring resistor and the third measuring resistor; when the at least one measuring resistor includes a first measuring resistor, a second measuring resistor, and a third measuring resistor, determining whether the cell to be tested is in a non-short-circuit state, a cathode-to-cathode short-circuit state, anode-to-packaging bag short-circuit state, or cathode-to-packaging bag short-circuit state based on the first measuring resistor, the second measuring resistor, and the third measuring resistor.

[0008] In the above scheme, different measuring resistors are used to determine different battery cell states, which can meet different application requirements.

[0009] In some embodiments, based on the first measured resistance, the second measured resistance and the third measured resistance, determining whether the battery cell to be tested is in a non-short-circuited state, a cathode-cathode short-circuited state, anode-to-packaging bag short-circuited state, or cathode-to-packaging bag short-circuited state, includes: in response to the first measured resistance and the first threshold satisfying a first size relationship, determining that the battery cell to be tested is in a cathode-cathode short-circuited state; in response to the first measured resistance and the first threshold not satisfying the first size relationship, determining based on the second measured resistance and the third measured resistance whether the battery cell to be tested is in a non-short-circuited state, anode-to-packaging bag short-circuited state, or cathode-to-packaging bag short-circuited state.

[0010] In the above scheme, based on the resistance between the anode tab and the cathode tab, it is possible to directly determine whether the battery cell is in a cathode-cathode short-circuit state. If not, the specific state of the battery cell can be determined based on the resistance between the anode tab and the packaging bag, and the resistance between the cathode tab and the packaging bag, which can accurately reflect the short-circuit condition of the battery cell.

[0011] In some embodiments, based on the second measured resistance and the third measured resistance, determining whether the battery cell to be tested is in a non-short-circuited state, a state in which the anode and the packaging bag are short-circuited, or a state in which the cathode and the packaging bag are short-circuited includes: in response to the second measured resistance or the third measured resistance and the second threshold satisfying a second size relationship, determining that the battery cell to be tested is in a non-short-circuited state; in response to the second measured resistance or the third measured resistance and the second threshold not satisfying the second size relationship, determining whether the battery cell to be tested is in a state in which the anode and the packaging bag are short-circuited, or a state in which the cathode and the packaging bag are short-circuited, based on the size relationship between the second measured resistance and the third measured resistance.

[0012] In the above scheme, whether the battery cell is in a non-short-circuit state can be determined based on the resistance between the anode tab and the packaging bag and the resistance between the cathode tab and the packaging bag. If not, the specific state of the battery cell is further determined based on the relationship between the two, which can accurately reflect the specific short-circuit situation of the battery cell.

[0013] In some embodiments, based on the size relationship between the second measuring resistor and the third measuring resistor, determining whether the battery cell to be tested is in a state of short circuit between the anode and the packaging bag or a state of short circuit between the cathode and the packaging bag includes: in response to a third size relationship between the second measuring resistor and the third measuring resistor, determining that the battery cell to be tested is in a state of short circuit between the anode and the packaging bag; in response to a fourth size relationship between the second measuring resistor and the third measuring resistor, determining that the battery cell to be tested is in a state of short circuit between the cathode and the packaging bag.

[0014] In the above scheme, based on whether the size relationship between the second measuring resistor and the third measuring resistor satisfies the third size relationship and the fourth size relationship, it is determined whether the battery cell is in a state of short circuit between the anode and the packaging bag or between the cathode and the packaging bag, which can accurately reflect the specific short circuit situation of the battery cell.

[0015] In some embodiments, the first size relationship is that the first measured resistance is less than the first threshold; the second size relationship is that the second measured resistance or the third measured resistance is greater than the second threshold; the third size relationship is that the second measured resistance is less than the third measured resistance, and the fourth size relationship is that the second measured resistance is greater than the third measured resistance.

[0016] In the above scheme, by setting the threshold value and the size relationship, the resistance value and the size relationship of the measuring resistor are used to determine the state of the battery cell, and the specific short circuit situation of the battery cell is accurately reflected.

[0017] In some embodiments, the cathode-to-packaging bag short-circuit state includes the cathode tab and the packaging bag short-circuit state, and the cathode outermost layer and the packaging bag short-circuit state; after determining the cell state of the cell to be tested based on at least one measured resistance, the method further includes: in response to determining that the cell to be tested is in the cathode-to-packaging bag short-circuit state, obtaining a fifth measured resistance of the cell to be tested, wherein the fifth measured resistance is the resistance between the cathode tab and the packaging bag measured after removing the internal structure of the cell to be tested; based on the fifth measured resistance, determining whether the cell to be tested is in the cathode tab and packaging bag short-circuit state or the cathode outermost layer and the packaging bag short-circuit state.

[0018] In the above scheme, after the internal structure of the battery cell is removed, the resistance between the cathode tab and the packaging bag is measured, which can determine whether the battery cell is in a short-circuit state between the cathode tab and the packaging bag or between the cathode outermost layer and the packaging bag, thereby further locating the short-circuit position of the battery cell.

[0019] In some embodiments, based on the fifth measured resistance, determining whether the battery cell to be tested is in a state of short circuit between the cathode tab and the packaging bag or between the cathode outermost layer and the packaging bag is short circuited includes: in response to the fifth measured resistance and the third threshold satisfying a fifth size relationship, determining that the battery cell to be tested is in a state of short circuit between the cathode outermost layer and the packaging bag; in response to the fifth measured resistance and the third threshold not satisfying the fifth size relationship, determining that the battery cell to be tested is in a state of short circuit between the cathode tab and the packaging bag; wherein the fifth size relationship is that the fifth measured resistance is greater than the third threshold.

[0020] In the above scheme, according to the relationship between the resistance between the cathode tab and the packaging bag and the threshold value, it is possible to judge whether the cathode tab of the battery cell is short-circuited with the packaging bag or the cathode outermost layer is short-circuited with the packaging bag.

[0021] The present application provides a device for determining the short-circuit position of a battery cell, including an acquisition module and a determination module. The acquisition module is used to acquire at least one measured resistance of a battery cell to be tested, wherein the battery cell to be tested is not filled with electrolyte, and the at least one measured resistance includes at least one of a first measured resistance between an anode pole ear and a cathode pole ear of the battery cell to be tested, a second measured resistance between an anode pole ear and a packaging bag, and a third measured resistance between a cathode pole ear and a packaging bag; the determination module is used to determine the battery cell state of the battery cell to be tested based on the at least one measured resistance, and the battery cell state includes a non-short-circuit state, a cathode-cathode short-circuit state, and an anode-cathode short-circuit state. At least one of the packaging bag short-circuit state and the cathode and packaging bag short-circuit state, the first measuring resistor is used to determine whether the battery cell to be tested is in the anode and cathode short-circuit state; the second measuring resistor or the third measuring resistor is used to determine whether the battery cell to be tested is in the first short-circuit state or the second short-circuit state, the first short-circuit state is no short-circuit state, or the anode and cathode short-circuit state, the second short-circuit state is the anode and packaging bag short-circuit state, or the cathode and packaging bag short-circuit state; the size relationship between the second measuring resistor and the third measuring resistor is used to determine whether the battery cell to be tested is in the anode and packaging bag short-circuit state or the cathode and packaging bag short-circuit state.

[0022] The present application provides an electronic device, including a memory and a processor, wherein program instructions are stored in the memory, and when the program instructions are executed by the processor, the above-mentioned method for determining the short-circuit position of a battery cell is implemented.

[0023] The present application provides a computer-readable storage medium on which program instructions are stored. When the program instructions are executed by a processor, the above-mentioned method for determining the short-circuit position of a battery cell is implemented.

[0024] In the above scheme, the measured resistance of the battery cell can reflect the resistance value inside the battery cell. The battery cell state can be determined based on at least one measured resistance of the battery cell to indicate the short circuit condition of the battery cell. The resistance between the anode tab and the cathode tab can reflect whether there is a short circuit between the cathode and cathode of the battery cell. The resistance between the anode tab and the packaging bag or the resistance between the cathode tab and the packaging bag can reflect whether the battery cell is in the first short circuit state or the second short circuit state. The relationship between the second measured resistance and the third measured resistance can reflect whether there is a short circuit between the anode and the packaging bag or between the cathode and the packaging bag.

[0025] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings herein are incorporated into the specification and constitute a part of the specification. These drawings illustrate embodiments consistent with the present application and are used together with the specification to illustrate the technical solution of the present application.

[0027] Figure 1is a flow chart of a method for determining a short circuit position of a battery cell provided in some embodiments of the present application;

[0028] Figure 2 is a schematic diagram of a battery cell structure provided by some embodiments of the present application;

[0029] Figure 3 is a schematic diagram of a cell circuit provided in some embodiments of the present application;

[0030] Figure 4 It is a test circuit diagram corresponding to different resistance test port access solutions provided in some embodiments of the present application;

[0031] Figure 5 is a flow chart of a method for determining a short-circuit position of a battery cell provided in some other embodiments of the present application;

[0032] Figure 6 is a schematic diagram of a framework of a battery cell short circuit position determination device provided in some embodiments of the present application;

[0033] Figure 7 is a schematic diagram of a framework of an electronic device provided in some embodiments of the present application;

[0034] Figure 8 It is a schematic diagram of the framework of the computer-readable storage medium provided in some embodiments of the present application. DETAILED DESCRIPTION

[0035] The scheme of the embodiment of the present application is described in detail below in conjunction with the drawings of the specification.

[0036] In the following description, for the purpose of explanation rather than limitation, specific details such as specific subsystem structures, interfaces, and technologies are provided to facilitate a thorough understanding of the present application.

[0037] The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the objects associated before and after are in an "or" relationship. In addition, "many" in this article means two or more than two. In addition, the term "at least one" in this article means any combination of at least two of any one or more of a plurality of, for example, including at least one of A, B, and C, can mean including any one or more elements selected from the set consisting of A, B, and C.

[0038] The internal short circuit of the battery cell will affect the storage and use of the battery cell. For example, the self-discharge caused by the internal short circuit will cause the battery cell to fail during storage, such as low voltage and zero voltage. The internal short circuit may cause poor self-discharge consistency among a batch of battery cells in the battery pack, leading to safety issues such as overcharging and over-discharging, and ultimately reducing the life of the battery module or causing safety issues. Short circuits may occur at multiple locations inside the battery cell, but existing detection methods cannot determine the location where the battery cell short circuit occurs. In the method for determining the short circuit position of the battery cell disclosed in the embodiment of the present application, the measured resistance of the battery cell is obtained. The measured resistance can reflect the resistance value inside the battery cell, which can also reflect the short circuit situation. The battery cell state can be determined based on at least one measured resistance of the battery cell to indicate the short circuit situation of the battery cell.

[0039] The method for determining the short-circuit position of a battery cell disclosed in the embodiment of the present application can be applied to a battery cell that has not yet been injected with electrolyte, and the type of the battery cell is not limited.

[0040] See also Figure 1 , Figure 1 1 is a flow chart of a method for determining a short circuit position of a battery cell provided in some embodiments of the present application. Specifically, the method may include:

[0041] Step S110: obtaining at least one measured resistance of the battery cell to be tested.

[0042] The cell to be tested may be a cell that has not yet been injected with electrolyte. The measured resistance is obtained by measuring the resistance of the cell to be tested, and different measured resistances may be obtained by setting resistance test ports at different components of the cell to be tested.

[0043] The measured resistance of the battery cell can reflect the resistance inside the battery cell. Since a short circuit will cause a change in resistance, it can be used to determine the short circuit condition inside the battery cell.

[0044] See also Figure 2 , Figure 2 It is a schematic diagram of a battery cell structure provided in some embodiments of the present application.

[0045] Figure 2 Figure a is a schematic diagram of the external structure of the battery cell. Figure 2 Figure b is a schematic diagram of the internal structure of a battery cell. Figure 2 Figure c is a schematic diagram of the internal structure of another battery cell.

[0046] The battery cell 10 includes a packaging bag 11, a cathode (not shown in the figure), an anode (not shown in the figure) and a tab glue 12, wherein the anode includes an anode sheet (not shown in the figure) and an anode tab 13, and the cathode includes a cathode sheet (not shown in the figure) and a cathode tab 14.

[0047] The internal structure of the battery cell 10 is arranged in the packaging bag 11, including the anode sheet, the cathode sheet, etc., and one end of the anode tab 13 and the cathode tab 14 are welded to the anode sheet and the cathode sheet respectively. The other end of the anode tab 13 and the cathode tab 14 pass through the packaging bag 11.

[0048] Figure 2 Figure b shows a winding structure inside a battery cell. Figure 2 Figure c shows a laminated structure inside a battery cell. Among the internal structures of the battery cell 10, the part in contact with the packaging bag 11 may be the cathode outermost layer 15. In some embodiments, the cathode outermost layer 15 is an outer ring of aluminum foil.

[0049] The anode tab 13 and the packaging bag 11 are blocked and insulated by the tab glue 12, the cathode tab 14 and the packaging bag 11 are blocked and insulated by the tab glue 12, the cathode and the anode are blocked and insulated by a diaphragm, an insulating layer is provided on the inside of the packaging bag 11, and the cathode outermost layer 15 and the packaging bag 11 are blocked and insulated by an insulating layer (such as a polypropylene PP layer).

[0050] It can be understood that by connecting the resistance test port to different components of the battery cell, the measured resistance of the different components of the battery cell can be obtained.

[0051] Among them, the measuring resistor may include at least one of a first measuring resistor, a second measuring resistor and a third measuring resistor, the first measuring resistor is the resistance between the anode tab and the cathode tab of the battery cell to be tested, the second measuring resistor is the resistance between the anode tab and the packaging bag, and the third measuring resistor is the resistance between the anode tab and the packaging bag.

[0052] Step S120: determining the cell state of the cell to be tested based on at least one measuring resistor.

[0053] The cell status may indicate the short circuit condition of the cell, specifically, whether there is a short circuit and the location of the short circuit. Further, the cell status includes at least one of a no short circuit state, a cathode and cathode short circuit state, an anode and packaging bag short circuit state, and a cathode and packaging bag short circuit state.

[0054] Furthermore, the internal short position of the battery cell may be caused by improper processing of the previous procedure of the corresponding component. Therefore, the internal short position of the battery cell can indicate the improvement direction of the previous procedure.

[0055] It is understandable that there may be a short circuit between the positive and negative electrodes of the battery cell, between the anode and the packaging bag, and between the cathode and the packaging bag. Different battery cell states can be divided according to whether the battery cell is short-circuited and the location of the short circuit. The division method of the battery cell state can be set according to the actual application needs.

[0056] In some embodiments, it can be accurately determined whether the cell state of the cell to be tested is in one of the above four states.

[0057] In some embodiments, the cell state of the cell to be tested can be located within a certain range. Exemplarily, the cell state can be determined as a first short circuit state or a second short circuit state. The first short circuit state is a no short circuit state or a cathode short circuit state, and the second short circuit state is a short circuit state between the anode and the packaging bag or a short circuit state between the cathode and the packaging bag.

[0058] It is understandable that the measurement resistance may be obtained according to actual application requirements, and accordingly, different measurement resistances may be able to determine different states of the battery cell.

[0059] The first measuring resistor can be used to determine whether the battery cell to be tested is in a cathode-cathode short-circuit state.

[0060] Among them, the second measuring resistor and the third measuring resistor can be used to determine whether the battery cell to be tested is in the first short-circuit state or the second short-circuit state, wherein the first short-circuit state is a no short-circuit state or a cathode and anode short-circuit state, and the second short-circuit state is a anode and packaging bag short-circuit state or a cathode and packaging bag short-circuit state.

[0061] The magnitude relationship between the second measuring resistor and the third measuring resistor can be used to determine whether the battery cell to be tested is in a state where the anode and the packaging bag are short-circuited or the cathode and the packaging bag are short-circuited.

[0062] In the above scheme, the measured resistance of the battery cell can reflect the resistance value inside the battery cell, and the battery cell state can be determined based on at least one measured resistance of the battery cell to indicate the short circuit condition of the battery cell. Specifically, it can be used to determine whether there is a short circuit in the battery cell, and if there is a short circuit, it can be used to determine the location of the short circuit.

[0063] It is understood that the short circuit state between the anode and the packaging bag is generally a short circuit between the anode tab and the packaging bag. The short circuit state between the cathode and the packaging bag may be a short circuit between the cathode tab and the packaging bag, or a short circuit between the cathode outermost layer and the packaging bag. In some embodiments, the short circuit state between the cathode and the packaging bag can be further divided into a short circuit state between the cathode tab and the packaging bag and a short circuit state between the cathode outermost layer and the packaging bag.

[0064] See also Figure 3 , Figure 3 It is a schematic diagram of a battery cell circuit provided in some embodiments of the present application.

[0065] Figure 3 A schematic diagram of a cell circuit without electrolyte injection is given in FIG.

[0066] The battery cell 10 includes a packaging bag 11 , an anode 16 , a cathode 17 and tab glue, wherein the anode 16 includes an anode tab 13 , and the cathode 17 includes a cathode tab 14 and a cathode outermost layer (not shown in the figure).

[0067] The anode tab 13 and the packaging bag 11 are blocked and insulated by tab glue (not shown in the figure), and the resistance between the anode tab 13 and the packaging bag 11 is represented by R1. The cathode 17 and the anode 16 are blocked and insulated by a diaphragm (not shown in the figure), and the resistance between the cathode 17 and the anode 16 is represented by R2. The cathode tab 14 and the packaging bag 11 are blocked and insulated by tab glue (not shown in the figure), and the resistance between the cathode tab 14 and the packaging bag 11 is represented by R3. An insulating layer is provided on the inside of the packaging bag 11, and the outermost layer of the cathode and the packaging bag 11 are blocked and insulated by the insulating layer, and the resistance between the outermost layer of the cathode and the packaging bag 11 is represented by R4. The following description takes the outermost layer of the cathode as the outer ring aluminum foil as an example.

[0068] If the relevant parts are damaged or pierced by foreign objects, resulting in a short circuit, the corresponding resistance value will change.

[0069] In an application scenario, when there is no internal short circuit in the battery cell, under ideal conditions, the resistance values ​​are as follows: R1→∞, Rj<R2<Rw, R3→∞, R4→∞.

[0070] Furthermore, if there is a short circuit between the anode tab and the packaging bag, R1 will change, R1<Rs, where R1>>Rs in the absence of a short circuit. If there is a short circuit between the cathode and the anode, R2 will change, R2<Rj. If there is a short circuit between the cathode tab and the packaging bag, R3 will change, R3<Rs. If there is a short circuit between the outer aluminum foil and the packaging bag, R4 will change, R4<Rs.

[0071] See also Figure 4 , Figure 4 This is a test circuit diagram corresponding to different resistance test port access schemes provided in some embodiments of the present application.

[0072] like Figure 4 As shown, three different resistance test port access schemes are set up to test the resistance between two ports, namely anode tab-cathode tab, anode tab-packaging bag, and cathode tab-packaging bag.

[0073] It is understandable that by adopting different resistance test port access schemes, the test circuit diagrams between the two test ports may be different.

[0074] The resistance values ​​of each resistor under different battery cell states are as follows:

[0075]

[0076] Among them, the specific values ​​of Rs, Rj, and Rw are related to the battery cell. Exemplarily, Rs is approximately equal to or equal to 200MΩ, Rj is approximately equal to or equal to 20MΩ, and Rw is approximately equal to or equal to 500MΩ. In the absence of a short circuit between the anode tab and the packaging bag, R1 can be considered to be close to infinity. Specifically, it can be considered to be much larger than Rs. Exemplarily, its actual measured value is greater than a preset multiple of Rs. Exemplarily, the actual measured value is greater than 5 times of Rs.

[0077] The corresponding resistance values ​​of each resistance test port under different battery cell states are as follows:

[0078]

[0079] The resistance test port is connected to the anode tab and cathode tab. (1) If there is no internal short circuit in the battery cell, Rj<R2<Rw, R1 / R3 / R4→∞, the resistance of branch b→∞, and the resistance of the parallel circuit depends on the branch a with a smaller resistance, so the parallel resistance Rj<R<Rw. (2) When the cathode and cathode are short-circuited, R2<Rj, and other components are not short-circuited, R1 / R3 / R4→∞, the resistance of the parallel circuit depends on the branch a with a smaller resistance, so the parallel resistance R<Rj. (3) When the anode tab and the packaging bag are short-circuited, R1<Rs, and R2 / R3 / R4 are not short-circuited, Rj<R2<Rw, R3 / R4→∞, the resistance of branch b→∞, and the resistance of the parallel circuit depends on the branch a with a smaller resistance, so the parallel resistance Rj<R<Rw. (4) When the cathode tab is short-circuited with the packaging bag, R3 < Rs, while R1, R2, and R4 are not short-circuited, Rj < R2 < Rw, R1 / R4 → ∞, the resistance of branch b → ∞, the resistance of the parallel circuit depends on the branch a with a smaller resistance, so the parallel resistance Rj < R < Rw. (5) When the outer aluminum foil is short-circuited with the packaging bag, R4 < Rs, while R1, R2, and R3 are not short-circuited, Rj < R2 < Rw, R1 / R3 → ∞, the resistance of branch b → ∞, the resistance of the parallel circuit depends on the branch a with a smaller resistance, so the parallel resistance Rj < R < Rw.

[0080] When the resistance test port is connected to the anode tab-packaging bag, (1) if there is no internal short circuit in the battery cell, Rj<R2<Rw, R1 / R3 / R4→∞, branch c resistance / branch d resistance→∞, so the parallel resistance R→∞. (2) When the cathode and cathode are short-circuited, R2<Rj, while other components are not short-circuited, R1 / R3 / R4→∞, branch c resistance / branch d resistance→∞, so the parallel resistance R→∞. (3) When the anode tab and the packaging bag are short-circuited, R1<Rs, while R2, R3, and R4 are not short-circuited, Rj<R2<Rw, R3 / R4→∞, branch d resistance→∞, the parallel circuit resistance depends on the branch c with a smaller resistance, so the parallel resistance R<Rs. (4) When the cathode tab is short-circuited with the packaging bag, R3 < Rs, while R1, R2, and R4 are not short-circuited, Rj < R2 < Rw, R1 / R4 → ∞, the parallel resistance of R3 and R4 depends on R3, and the resistance value is < Rs. The resistance value of the parallel circuit depends on the branch d with a smaller resistance value, so the parallel resistance Rj < R < (Rw + Rs). (5) When the outer ring aluminum foil is short-circuited with the packaging bag, R4 < Rs, while R1, R2, and R3 are not short-circuited, Rj < R2 < Rw, R1 / R3 → ∞, the parallel resistance of R3 and R4 depends on R4, and the resistance value is < Rs. The resistance value of the parallel circuit depends on the branch d with a smaller resistance value, so the parallel resistance Rj < R < (Rw + Rs).

[0081] When the resistance test port is connected to the cathode tab-packaging bag, (1) if there is no internal short circuit in the battery cell, Rj<R2<Rw, R1 / R3 / R4→∞, branch e resistance / branch f resistance / branch g resistance→∞, so the parallel resistance R→∞. (2) When the cathode and cathode are short-circuited, R2<Rj, and other components are not short-circuited, R1 / R3 / R4→∞, branch e resistance / branch f resistance / branch g resistance→∞, so the parallel resistance R→∞. (3) When the anode tab and the packaging bag are short-circuited, R1<Rs, and R2, R3, and R4 are not short-circuited, Rj<R2<Rw, R3 / R4→∞, branch e resistance / branch f resistance→∞, the parallel circuit resistance depends on the branch g with a smaller resistance, so the parallel resistance Rj<R<(Rw+Rs). (4) When the cathode tab is short-circuited with the packaging bag, R3 < Rs, while R1, R2, and R4 are not short-circuited, Rj < R2 < Rw, R1 / R4 → ∞, branch g resistance / branch f resistance → ∞, the parallel circuit resistance depends on the branch e with a smaller resistance, so the parallel resistance R < Rs. (5) When the outer aluminum foil is short-circuited with the packaging bag, R4 < Rs, while R1, R2, and R3 are not short-circuited, Rj < R2 < Rw, R1 / R3 → ∞, branch e resistance / branch g resistance → ∞, the parallel circuit resistance depends on the branch f with a smaller resistance, so the parallel resistance R < Rs.

[0082] According to the above resistance values, the first measuring resistor can be used to determine whether the battery cell to be tested is in a cathode short-circuit state. The second measuring resistor or the third measuring resistor can be used to determine whether the battery cell to be tested is in a first short-circuit state or a second short-circuit state.

[0083] When the anode and the packaging bag are short-circuited, if the resistance test port is connected to the anode tab-packaging bag, the resistance of branch d →∞, and the second measured resistance can be considered to be approximately R1. If the resistance test port is connected to the cathode tab-packaging bag, the resistance of branch e / the resistance of branch f →∞, and the third measured resistance can be considered to be approximately (R1+R2). At this time, the second measured resistance is smaller than the third measured resistance.

[0084] When the cathode and the packaging bag are short-circuited, if the resistance test port is connected to the anode tab-packaging bag, the second test resistance is approximately (R3+R2) or (R4+R2). If the resistance test port is connected to the cathode tab-packaging bag, the third measured resistance can be considered to be approximately R3 or R4. At this time, the second measured resistance is greater than the third measured resistance.

[0085] Therefore, the magnitude relationship between the second measuring resistor and the third measuring resistor can be used to determine whether the battery cell to be tested is in a state where the anode and the packaging bag are short-circuited, or the cathode and the packaging bag are short-circuited.

[0086] In some embodiments, if the obtained measured resistance includes a first measured resistance, it can be determined whether the battery cell to be tested is in a short-circuited state between the anode and cathode according to the first measured resistance. If not, it can be determined that the battery cell state of the battery cell to be tested is one of a non-short-circuited state, a short-circuited state between the anode and the packaging bag, and a short-circuited state between the cathode and the packaging bag. In a specific application scenario, a corresponding first threshold value can be set for the first measured resistance, and the judgment is made based on the magnitude relationship between the first measured resistance and the first threshold value.

[0087] In some embodiments, the number of measured resistors obtained is two, and they are the first measured resistor and the fourth measured resistor, respectively, wherein the fourth measured resistor may be the second measured resistor or the third measured resistor. Based on the first measured resistor and the fourth measured resistor, it can be determined whether the battery cell to be tested is in a non-short-circuited state, a cathode short-circuited state, or a second short-circuited state.

[0088] In a specific application scenario, whether the battery cell to be tested is in a cathode short-circuit state can be determined based on the first measured resistance. And, whether the battery cell to be tested is in a first short-circuit state or a second short-circuit state can be determined based on the fourth measured resistance. If it is in the first short-circuit state and not in the cathode short-circuit state, the battery cell to be tested is in a non-short-circuit state.

[0089] In a specific application scenario, a corresponding second threshold value may be set for the fourth measurement resistor, and a judgment is made based on a magnitude relationship between the fourth measurement resistor and the second threshold value.

[0090] In some embodiments, the number of measured resistances obtained is two, which are the second measured resistance and the third measured resistance. Based on the second measured resistance and the third measured resistance, it can be determined whether the battery cell to be tested is in the first short circuit state, the anode and the packaging bag short circuit state, or the cathode and the packaging bag short circuit state.

[0091] In one implementation scenario, based on the second measured resistance or the third measured resistance, it can be determined whether the battery cell to be tested is in the first short-circuit state or the second short-circuit state. If it is in the second short-circuit state, based on the size relationship between the two, it can be determined whether the battery cell to be tested is in the anode and packaging bag short-circuit state or the cathode and packaging bag short-circuit state. Specifically, if the second measured resistance is greater than the third measured resistance, the battery cell to be tested is in the cathode and packaging bag short-circuit state, and if the second measured resistance is less than the third measured resistance, the battery cell to be tested is in the anode and packaging bag short-circuit state.

[0092] In some embodiments, the obtained measured resistance includes a first measured resistance, a second measured resistance, and a third measured resistance. Based on the first measured resistance, the second measured resistance, and the third measured resistance, it can be determined whether the battery cell to be tested is in a non-short-circuited state, a cathode-cathode short-circuited state, an anode-to-package short-circuited state, or a cathode-to-package short-circuited state.

[0093] In some implementation scenarios, it is determined whether the first measured resistance and the first threshold satisfy a first magnitude relationship, and in response to satisfying the first magnitude relationship, it is determined that the battery cell to be tested is in a cathode-cathode short-circuit state. In response to not satisfying the first magnitude relationship, it is determined that the battery cell to be tested is in a non-short-circuit state, anode-to-package short-circuit state, or cathode-to-package short-circuit state. Further, based on the second measured resistance and the third measured resistance, it can be determined which of the three states the battery cell state is.

[0094] In some application scenarios, it is determined whether the second measured resistance or the third measured resistance satisfies the second magnitude relationship with the second threshold value; in response to satisfying the second magnitude relationship, it is determined that the battery cell to be tested is in a non-short-circuited state. In response to not satisfying the second magnitude relationship, it is determined that the battery cell to be tested is in a state where the anode is short-circuited to the packaging bag or the cathode is short-circuited to the packaging bag. Further, based on the magnitude relationship between the second measured resistance and the third measured resistance, it can be determined which of the two states the battery cell is in.

[0095] In some implementation scenarios, it is determined whether the third size relationship and the fourth size relationship are satisfied between the second measuring resistor and the third measuring resistor. In response to satisfying the third size relationship, it is determined that the battery cell to be tested is in a state of short-circuiting the anode and the packaging bag. In response to satisfying the fourth size relationship, it is determined that the battery cell to be tested is in a state of short-circuiting the cathode and the packaging bag.

[0096] The first magnitude relationship may be that the first measured resistance is less than a first threshold value. The first threshold value may be set according to Rj. For example, the first threshold value may be set to be the same as Rj, which is 20 MΩ.

[0097] Among them, the second magnitude relationship can be that the second measured resistance or the third measured resistance is greater than the second threshold value. It can be understood that satisfying the second magnitude relationship can indicate that the second measured resistance or the third measured resistance satisfies the open circuit condition, and the resistance value can be considered to be close to infinity. The second threshold value can be set according to Rw, Rj, and Rs. Exemplarily, the second threshold value can be set to be the same as Rw+Rs, or can be greater than Rw+Rs, such as 1000MΩ.

[0098] The third magnitude relationship may be that the second measurement resistor is smaller than the third measurement resistor. The fourth magnitude relationship may be that the second measurement resistor is larger than the third measurement resistor.

[0099] It is understandable that a short circuit may occur between the cathode tab and the packaging bag, and a short circuit may occur between the outer ring aluminum foil and the packaging bag. In order to be able to distinguish these two situations more accurately, the method also includes: further obtaining the fifth measured resistance of the battery cell to be tested, and determining whether the battery cell to be tested is in a state of short circuit between the cathode tab and the packaging bag or a state of short circuit between the outer ring aluminum foil and the packaging bag based on the fifth measured resistance. Among them, the fifth measured resistance can be the resistance between the cathode tab and the packaging bag measured after the internal structure of the battery cell to be tested is removed.

[0100] Based on the fifth measuring resistance, it can be directly determined whether there is a short circuit between the cathode tab and the packaging bag. If there is no short circuit, it can be determined that the battery cell to be tested is in a short circuit state between the outer ring aluminum foil and the packaging bag.

[0101] In some embodiments, it is determined whether the fifth measured resistance and the third threshold satisfy a fifth size relationship. In response to satisfying the fifth size relationship, it is determined that the battery cell to be tested is in a short-circuit state between the outer ring aluminum foil and the packaging bag; in response to not satisfying the fifth size relationship, it is determined that the battery cell to be tested is in a short-circuit state between the cathode tab and the packaging bag.

[0102] Among them, the fifth magnitude relationship can be that the fifth measured resistance is greater than the third threshold value. It can be understood that satisfying the fifth magnitude relationship can indicate that the fifth measured resistance satisfies the open circuit condition, and the resistance value can be considered to be approaching infinity. The third threshold value can be set according to Rs, and illustratively, can be set to be the same as Rs, 200MΩ, or can be greater than Rs, such as 700MΩ.

[0103] See also Figure 5 , Figure 5 It is a flow chart of a method for determining a short-circuit position of a battery cell provided in some other embodiments of the present application.

[0104] When the resistance test port is connected to the anode tab and the cathode tab, if the test resistance Ra is less than the first threshold value Rj, it is determined that the cathode and cathode are short-circuited; otherwise, the cathode and cathode are not short-circuited.

[0105] Conduct resistance test on the battery cell without short circuit between anode and cathode, connect the test port to anode tab-packaging bag, and test resistance is Rb. If the test resistance Rb is greater than the second threshold, it can be considered that the test resistance Rb satisfies Rb→∞, and it can be reversed to determine that the battery cell has no short circuit. The reason is that any of the short circuit state between anode tab and packaging bag, short circuit state between cathode tab and packaging bag, and short circuit state between outer ring aluminum foil and packaging bag does not satisfy Rb→∞. If the test resistance Rb does not satisfy the second threshold, record the Rb value.

[0106] For cells whose Rb does not satisfy Rb→∞, resistance test is performed, the test port is connected to the cathode tab-packaging bag, and the test resistance is Rc. If Rc>Rb, it is determined that the anode and the packaging bag are short-circuited, specifically, the anode tab and the packaging bag are short-circuited. If Rc<Rb, it is determined that the cathode and the packaging bag are short-circuited. In some cases, judgment conditions can also be set such as Rc>Rb, in which case it is determined that the anode tab and the packaging bag are short-circuited; if Rc>Rb is not satisfied, it is determined that the cathode and the packaging bag are short-circuited.

[0107] The reason is that when the anode is short-circuited with the packaging bag, the test port is set to cathode tab-packaging bag, and the tested resistance Rc is approximately (R1+R2), and when the test port is set to anode tab-packaging bag, the tested resistance Rb is approximately R1, so Rc>Rb. When the cathode is short-circuited with the packaging bag (cathode tab and packaging bag are short-circuited or outer ring aluminum foil and packaging bag are short-circuited), the test port is set to cathode tab-packaging bag, and the tested resistance Rc is approximately R3 or R4, and when the test port is set to anode tab-packaging bag, the tested resistance Rb is approximately (R2+R3) or (R2+R4), so Rc<Rb.

[0108] The battery cells that do not satisfy Rc>Rb (or Rc<Rb) can be further identified by removing the internal structure of the battery cell and directly testing the resistance Rd between the cathode tab and the packaging bag. If Rd is greater than the third threshold, it can be considered that the test resistance Rd satisfies Rd→∞, and it is determined that the outer ring aluminum foil and the packaging bag are short-circuited; if Rd does not satisfy Rd→∞, it is determined that the cathode tab and the packaging bag are short-circuited.

[0109] In some implementation scenarios, after removing the internal structure of the battery cell, when the test port is connected to the cathode tab-packaging bag, if there is no short circuit, the cathode and cathode are short-circuited, the anode and the packaging bag are short-circuited, or the outer aluminum foil and the packaging bag are short-circuited, ideally, the resistance value R→∞. If there is a short circuit between the cathode tab and the packaging bag, the test resistance value R<Rs. Therefore, a threshold can be set to distinguish between the short circuit state between the anode and the packaging bag and the short circuit state between the outer aluminum foil and the packaging bag.

[0110] See also Figure 6 , Figure 6 It is a schematic diagram of the framework of a battery cell short-circuit position determination device provided in some embodiments of the present application.

[0111] The cell short-circuit position determination device 60 includes an acquisition module 61 and a determination module 62 . The acquisition module 61 is used to obtain at least one measured resistance of the battery cell to be tested, where the battery cell to be tested is not injected with electrolyte, and the at least one measured resistance includes at least one of a first measured resistance between the anode electrode ear and the cathode electrode ear of the battery cell to be tested, a second measured resistance between the anode electrode ear and the packaging bag, and a third measured resistance between the cathode electrode ear and the packaging bag; the determination module 62 is used to determine the battery cell state of the battery cell to be tested based on the at least one measured resistance, and the battery cell state includes at least one of a non-short-circuit state, a cathode-cathode short-circuit state, an anode-bag short-circuit state, and a cathode-bag short-circuit state. The first measured resistance is used to determine whether the battery cell to be tested is in a cathode-cathode short-circuit state; the second measured resistance or the third measured resistance is used to determine whether the battery cell to be tested is in a first short-circuit state or a second short-circuit state, the first short-circuit state is a non-short-circuit state, or a cathode-cathode short-circuit state, and the second short-circuit state is anode-bag short-circuit state, or cathode-bag short-circuit state; the magnitude relationship between the second measured resistance and the third measured resistance is used to determine whether the battery cell to be tested is in anode-bag short-circuit state or cathode-bag short-circuit state.

[0112] In the above scheme, the measured resistance of the battery cell can reflect the resistance value inside the battery cell. The battery cell state can be determined according to at least one measured resistance of the battery cell to reflect the short circuit condition of the battery cell. The resistance between the anode tab and the cathode tab can reflect whether there is a short circuit between the cathode and cathode of the battery cell. The resistance between the anode tab and the packaging bag or the resistance between the cathode tab and the packaging bag can reflect whether the battery cell is in the first short circuit state or the second short circuit state. The relationship between the second measured resistance and the third measured resistance can reflect whether there is a short circuit between the anode and the packaging bag or between the cathode and the packaging bag.

[0113] In some embodiments, the determination module 62 is used to determine the cell state of the cell to be tested based on at least one measuring resistor, specifically including at least one of the following: when the number of at least one measuring resistor is two, and the two measuring resistors are the first measuring resistor and the fourth measuring resistor, based on the first measuring resistor and the fourth measuring resistor, determine whether the cell to be tested is in a non-short-circuit state, a cathode-cathode short-circuit state, or a second short-circuit state, and the fourth measuring resistor is the second measuring resistor or the third measuring resistor; when the number of at least one measuring resistor is two, and the two measuring resistors are the second measuring resistor and the third measuring resistor, based on the second measuring resistor and the third measuring resistor, determine whether the cell to be tested is in a first short-circuit state, anode-to-packaging bag short-circuit state, or cathode-to-packaging bag short-circuit state; when at least one measuring resistor includes the first measuring resistor, the second measuring resistor, and the third measuring resistor, determine whether the cell to be tested is in a non-short-circuit state, a cathode-to-cathode short-circuit state, anode-to-packaging bag short-circuit state, or cathode-to-packaging bag short-circuit state based on the first measuring resistor, the second measuring resistor, and the third measuring resistor.

[0114] In the above scheme, different measuring resistors are used to determine different battery cell states, which can meet different application requirements.

[0115] In some embodiments, the determination module 62 determines whether the battery cell to be tested is in a non-short-circuited state, a cathode-cathode short-circuited state, anode-to-packaging bag short-circuited state, or cathode-to-packaging bag short-circuited state based on the first measured resistance, the second measured resistance, and the third measured resistance, specifically including: in response to the first measured resistance and the first threshold satisfying a first size relationship, determining that the battery cell to be tested is in a cathode-cathode short-circuited state; in response to the first measured resistance and the first threshold not satisfying the first size relationship, determining that the battery cell to be tested is in a non-short-circuited state, anode-to-packaging bag short-circuited state, or cathode-to-packaging bag short-circuited state based on the second measured resistance and the third measured resistance.

[0116] In the above scheme, based on the resistance between the anode tab and the cathode tab, it is possible to directly determine whether the battery cell is in a cathode-cathode short-circuit state. If not, the specific state of the battery cell can be determined based on the resistance between the anode tab and the packaging bag, and the resistance between the cathode tab and the packaging bag, which can accurately reflect the short-circuit condition of the battery cell.

[0117] In some embodiments, the determination module 62 is used to determine whether the battery cell to be tested is in a non-short-circuited state, a state in which the anode and the packaging bag are short-circuited, or a state in which the cathode and the packaging bag are short-circuited based on the second measured resistance and the third measured resistance, specifically including: in response to the second measured resistance or the third measured resistance and the second threshold satisfying a second size relationship, determining that the battery cell to be tested is in a non-short-circuited state; in response to the second measured resistance or the third measured resistance and the second threshold not satisfying the second size relationship, determining whether the battery cell to be tested is in a state in which the anode and the packaging bag are short-circuited or the cathode and the packaging bag are short-circuited based on the size relationship between the second measured resistance and the third measured resistance.

[0118] In the above scheme, whether the battery cell is in a non-short-circuit state can be determined based on the resistance between the anode tab and the packaging bag and the resistance between the cathode tab and the packaging bag. If not, the specific state of the battery cell is further determined based on the relationship between the two, which can accurately reflect the specific short-circuit situation of the battery cell.

[0119] In some embodiments, the determination module 62 is used to determine whether the battery cell to be tested is in a state of short circuit between the anode and the packaging bag or a state of short circuit between the cathode and the packaging bag based on the size relationship between the second measuring resistor and the third measuring resistor, specifically including: in response to the second measuring resistor and the third measuring resistor satisfying a third size relationship, determining that the battery cell to be tested is in a state of short circuit between the anode and the packaging bag; in response to the second measuring resistor and the third measuring resistor satisfying a fourth size relationship, determining that the battery cell to be tested is in a state of short circuit between the cathode and the packaging bag.

[0120] In the above scheme, based on whether the size relationship between the second measuring resistor and the third measuring resistor satisfies the third size relationship and the fourth size relationship, it is determined whether the battery cell is in a state of short circuit between the anode and the packaging bag or between the cathode and the packaging bag, which can accurately reflect the specific short circuit situation of the battery cell.

[0121] In some embodiments, the first size relationship is that the first measured resistance is less than the first threshold; the second size relationship is that the second measured resistance or the third measured resistance is greater than the second threshold; the third size relationship is that the second measured resistance is less than the third measured resistance, and the fourth size relationship is that the second measured resistance is greater than the third measured resistance.

[0122] In the above scheme, by setting the threshold value and the size relationship, the resistance value and the size relationship of the measuring resistor are used to determine the state of the battery cell, and the specific short circuit situation of the battery cell is accurately reflected.

[0123] In some embodiments, the cathode-to-packaging bag short-circuit state includes the cathode ear-to-packaging bag short-circuit state, and the cathode outermost layer-to-packaging bag short-circuit state; the determination module 62 is also used to determine the cell state of the cell to be tested based on at least one measured resistance, and in response to determining that the cell to be tested is in the cathode-to-packaging bag short-circuit state, obtain a fifth measured resistance of the cell to be tested, wherein the fifth measured resistance is the resistance between the cathode ear and the packaging bag measured after removing the internal structure of the cell to be tested; based on the fifth measured resistance, determine whether the cell to be tested is in the cathode ear-to-packaging bag short-circuit state or the cathode outermost layer-to-packaging bag short-circuit state.

[0124] In the above scheme, after the internal structure of the battery cell is removed, the resistance between the cathode tab and the packaging bag is measured, which can determine whether the battery cell is in a short-circuit state between the cathode tab and the packaging bag or between the cathode outermost layer and the packaging bag, thereby further locating the short-circuit position of the battery cell.

[0125] In some embodiments, the judgment module 62 is used to determine whether the battery cell to be tested is in a state of short circuit between the cathode ear and the packaging bag or a state of short circuit between the cathode outermost layer and the packaging bag based on the fifth measured resistance, specifically including: in response to the fifth measured resistance and the third threshold satisfying a fifth size relationship, determining that the battery cell to be tested is in a state of short circuit between the cathode outermost layer and the packaging bag; in response to the fifth measured resistance and the third threshold not satisfying the fifth size relationship, determining that the battery cell to be tested is in a state of short circuit between the cathode ear and the packaging bag; wherein the fifth size relationship is that the fifth measured resistance is greater than the third threshold.

[0126] In the above scheme, according to the relationship between the resistance between the cathode tab and the packaging bag and the threshold value, it is possible to judge whether the cathode tab of the battery cell is short-circuited with the packaging bag or the cathode outermost layer is short-circuited with the packaging bag.

[0127] See also Figure 7 , Figure 7 It is a schematic diagram of the framework of an electronic device provided in some embodiments of the present application.

[0128] The electronic device 70 includes a memory 71 and a processor 72. The processor 72 is used to execute program instructions stored in the memory 71. When the program instructions are executed by the processor 72, any of the above-mentioned methods for determining the short-circuit position of the battery cell is implemented. In a specific implementation scenario, the electronic device 70 may include, but is not limited to: computer equipment, electrical equipment, microcomputers, desktop computers, servers, and in addition, the electronic device 70 may also include mobile devices such as laptops and tablet computers, which are not limited here.

[0129] Specifically, the processor 72 is used to control itself and the memory 71 to implement any of the above-mentioned methods for determining the short-circuit position of the battery cell. The processor 72 can also be called a CPU (Central Processing Unit). The processor 72 may be an integrated circuit chip with signal processing capabilities. The processor 72 can also be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. In addition, the processor 72 can be implemented by an integrated circuit chip.

[0130] See also Figure 8 , Figure 8 It is a schematic diagram of the framework of the computer-readable storage medium provided in some embodiments of the present application.

[0131] The computer-readable storage medium 80 stores program instructions 81 that can be executed by a processor. When the program instructions 81 are executed by the processor, they are used to implement any of the above-mentioned methods for determining the short-circuit position of a battery cell.

[0132] The above description of various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced to each other, and for the sake of brevity, they will not be repeated herein.

[0133] In the several embodiments provided in the present application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device implementation described above is only schematic. For example, the division of modules or units is only a logical function division. There may be other division methods in actual implementation, such as units or components can be combined or integrated into another subsystem, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0134] In addition, each functional unit in each embodiment of the present application can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit. If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or part of the contribution to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor (processor) to perform all or part of the steps of each implementation method of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program code.

Claims

1. A method for determining a short circuit position of a battery cell, characterized in that: include: Obtaining at least one measured resistance of the battery cell to be tested, wherein the battery cell to be tested is not filled with electrolyte, and the at least one measured resistance includes a second measured resistance between the anode tab and the packaging bag and a third measured resistance between the cathode tab and the packaging bag; Based on the at least one measuring resistor, determining a cell state of the cell to be tested, wherein the cell state includes a short circuit state between an anode and a packaging bag and a short circuit state between a cathode and a packaging bag; The determining the cell state of the cell to be tested based on the at least one measuring resistor comprises: In response to the fourth measured resistance and the second threshold not satisfying the second magnitude relationship, and the second measured resistance is less than the third measured resistance, it is determined that the battery cell to be tested is in a state of short circuit between the anode and the packaging bag; the fourth measured resistance is the second measured resistance or the third measured resistance; In response to the fourth measured resistance and the second threshold not satisfying the second magnitude relationship, and the second measured resistance being greater than the third measured resistance, it is determined that the battery cell to be tested is in a cathode-to-bag short-circuit state.

2. The method according to claim 1, characterized in that The battery cell state also includes a non-short-circuit state and a cathode-cathode short-circuit state; The determining the cell state of the cell to be tested based on the at least one measuring resistor further comprises: In response to the fourth measurement resistance and the second threshold satisfying a second magnitude relationship, it is determined that the battery cell to be tested is in a first short-circuit state, where the first short-circuit state is the non-short-circuit state or the cathode-cathode short-circuit state.

3. The method according to claim 1, characterized in that The at least one measuring resistor also includes a first measuring resistor between the anode tab and the cathode tab of the battery cell to be tested; the battery cell state also includes a non-short-circuit state and a cathode-cathode short-circuit state; The determining the cell state of the cell to be tested based on the at least one measuring resistor further comprises: In response to the first measuring resistance and the first threshold satisfying a first magnitude relationship, determining that the battery cell to be tested is in the cathode-cathode short-circuited state; In response to the first measured resistance and the first threshold not satisfying a first magnitude relationship, and the fourth measured resistance and the second threshold satisfying the second magnitude relationship, it is determined that the battery cell to be tested is in the non-short-circuit state.

4. The method according to claim 3, characterized in that The first magnitude relationship is that the first measured resistance is less than the first threshold value; The second magnitude relationship is that the second measured resistance or the third measured resistance is greater than the second threshold.

5. The method according to claim 1, characterized in that The short-circuit state between the cathode and the packaging bag includes the short-circuit state between the cathode tab and the packaging bag, and the short-circuit state between the cathode outermost layer and the packaging bag; After determining the cell state of the cell to be tested based on the at least one measuring resistor, the method further includes: In response to determining that the battery cell to be tested is in a state where the cathode and the packaging bag are short-circuited, obtaining a fifth measured resistance of the battery cell to be tested, wherein the fifth measured resistance is the resistance between the cathode tab and the packaging bag measured after removing the internal structure of the battery cell to be tested; Based on the fifth measured resistance, it is determined whether the battery cell to be tested is in a state where the cathode tab and the packaging bag are short-circuited or the cathode outermost layer and the packaging bag are short-circuited.

6. The method according to claim 5, characterized in that The determining, based on the fifth measured resistance, whether the battery cell to be tested is in a state where the cathode tab and the packaging bag are short-circuited or the cathode outermost layer and the packaging bag are short-circuited comprises: In response to the fifth measured resistance and the third threshold satisfying a fifth magnitude relationship, determining that the battery cell to be tested is in a state where the cathode outermost layer and the packaging bag are short-circuited; In response to the fifth measured resistance and the third threshold not satisfying a fifth magnitude relationship, determining that the battery cell to be tested is in a state where the cathode tab and the packaging bag are short-circuited; Among them, the fifth magnitude relationship is that the fifth measured resistance is greater than the third threshold.

7. A device for determining a short-circuit position of a battery cell, characterized in that: include: An acquisition module, used to acquire at least one measured resistance of the battery cell to be tested, wherein the battery cell to be tested is not filled with electrolyte, and the at least one measured resistance includes a second measured resistance between the anode tab and the packaging bag and a third measured resistance between the cathode tab and the packaging bag; A determination module is used to determine the cell state of the cell to be tested based on the at least one measured resistor, the cell state including the anode-to-packaging bag short-circuit state and the cathode-to-packaging bag short-circuit state, wherein the determination of the cell state of the cell to be tested based on the at least one measured resistor includes: in response to a fourth measured resistor and a second threshold not satisfying a second magnitude relationship, and the second measured resistor is less than the third measured resistor, determining that the cell to be tested is in a state where the anode and the packaging bag are short-circuited; the fourth measured resistor is the second measured resistor or the third measured resistor; in response to the fourth measured resistor and the second threshold not satisfying the second magnitude relationship, and the second measured resistor is greater than the third measured resistor, determining that the cell to be tested is in a state where the cathode and the packaging bag are short-circuited.

8. An electronic device, characterized in that: The method comprises a memory and a processor, wherein the memory stores program instructions, and the program instructions are used to execute the method according to any one of claims 1 to 6 when executed by the processor.

9. A computer-readable storage medium having program instructions stored thereon, characterized in that: When the program instructions are executed by a processor, the method according to any one of claims 1 to 6 is implemented.

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